{"@context":{"@vocab":"https://cir.nii.ac.jp/schema/1.0/","rdfs":"http://www.w3.org/2000/01/rdf-schema#","dc":"http://purl.org/dc/elements/1.1/","dcterms":"http://purl.org/dc/terms/","foaf":"http://xmlns.com/foaf/0.1/","prism":"http://prismstandard.org/namespaces/basic/2.0/","cinii":"http://ci.nii.ac.jp/ns/1.0/","datacite":"https://schema.datacite.org/meta/kernel-4/","ndl":"http://ndl.go.jp/dcndl/terms/","jpcoar":"https://github.com/JPCOAR/schema/blob/master/2.0/"},"@id":"https://cir.nii.ac.jp/crid/1360580232390828544.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.3847/2041-8213/aca281"}},{"identifier":{"@type":"URI","@value":"https://iopscience.iop.org/article/10.3847/2041-8213/aca281"}},{"identifier":{"@type":"URI","@value":"https://iopscience.iop.org/article/10.3847/2041-8213/aca281/pdf"}}],"resourceType":"学術雑誌論文(journal article)","dc:title":[{"@value":"X-Ray Polarization Observations of BL Lacertae"}],"description":[{"type":"abstract","notation":[{"@value":"<jats:title>Abstract</jats:title>\n               <jats:p>Blazars are a class of jet-dominated active galactic nuclei with a typical double-humped spectral energy distribution. It is of common consensus that the synchrotron emission is responsible for the low frequency peak, while the origin of the high frequency hump is still debated. The analysis of X-rays and their polarization can provide a valuable tool to understand the physical mechanisms responsible for the origin of high-energy emission of blazars. We report the first observations of BL Lacertae (BL Lac) performed with the Imaging X-ray Polarimetry Explorer, from which an upper limit to the polarization degree Π<jats:sub>\n                     <jats:italic>X</jats:italic>\n                  </jats:sub> < 12.6% was found in the 2–8 keV band. We contemporaneously measured the polarization in radio, infrared, and optical wavelengths. Our multiwavelength polarization analysis disfavors a significant contribution of proton-synchrotron radiation to the X-ray emission at these epochs. Instead, it supports a leptonic origin for the X-ray emission in BL Lac.</jats:p>"}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1380580232390827781","@type":"Researcher","foaf:name":[{"@value":"Riccardo Middei"}]},{"@id":"https://cir.nii.ac.jp/crid/1380580232390828305","@type":"Researcher","foaf:name":[{"@value":"Ioannis Liodakis"}]},{"@id":"https://cir.nii.ac.jp/crid/1380580232390828321","@type":"Researcher","foaf:name":[{"@value":"Matteo Perri"}]},{"@id":"https://cir.nii.ac.jp/crid/1380580232390828421","@type":"Researcher","foaf:name":[{"@value":"Simonetta Puccetti"}]},{"@id":"https://cir.nii.ac.jp/crid/1380580232390828319","@type":"Researcher","foaf:name":[{"@value":"Elisabetta Cavazzuti"}]},{"@id":"https://cir.nii.ac.jp/crid/1380580232390828164","@type":"Researcher","foaf:name":[{"@value":"Laura Di Gesu"}]},{"@id":"https://cir.nii.ac.jp/crid/1380580232390828197","@type":"Researcher","foaf:name":[{"@value":"Steven R. 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